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Ganapathy P.,Alagappa Chettiar College of Engineering And Technology | Manivasagam G.,Vellore Institute of Technology | Rajamanickam A.,Dhanalakshmi College of Engineering | Natarajan A.,Pondicherry Engineering College
International Journal of Nanomedicine | Year: 2015

This paper presents the wear characteristics of the composite ceramic coating made with Al2 O3 -40wt%8YSZ on the biomedical grade Ti-6Al-4V alloy (grade 5) used for total joint prosthetic components, with the aim of improving their tribological behavior. The coatings were deposited using a plasma spraying technique, and optimization of plasma parameters was performed using response surface methodology to obtain dense coating. The tribological behaviors of the coated and uncoated substrates were evaluated using a ball-on-plate sliding wear tester at 37°C in simulated body-fluid conditions. The microstructure of both the titanium alloy and coated specimen were examined using an optical microscope and scanning electron microscope. The hardness of the plasma-sprayed alumina–zirconia composite coatings was 2.5 times higher than that of the Ti-6Al-4V alloy, while the wear rate of Ti-6Al-4V alloy was 253 times higher than that of the composite-coated Ti-6Al-4V alloy. The superior wear resistance of the alumina–zirconia coated alloy is attributed to its enhanced hardness and intersplat bonding strength. Wear-track examination showed that the predominant wear mechanism of Ti-6Al-4V alloy was abrasive and adhesive wear, whereas, in the case of alumina–zirconia composite coated alloy, the wear was dominated by microchipping and microcracking. © 2015 Ganapathy et al. Source

Deepa Shri S.,Dhanalakshmi College of Engineering | Thenmozhi R.,Vellore Institute of Technology
Life Science Journal | Year: 2013

In this study new mathematical models were proposed and developed by using a regression equation for the prediction of impact energy absorption of hybrid ferrocement slabs. Slabs were made up of self-compacting concrete (SCC) in order to minimize the external vibration work. Slabs of size 300 X 300 mm with varying parameters such as depth of slab (25 & 30 mm), number of layers of weld mesh (2 and 3 layers bundled), and wrapping with Glass Fiber Reinforced Polymer sheets (GFRP) (1 and 2 layers) along with a specified proportion (0 and 0.30%) of polypropylene fibers were cast. Impact load was applied by means of a hammer of weight 3.5 kg (34.335 N) and the initial and ultimate energy absorptions were evaluated. The variables used in the prediction models were the varying parameters such as number of layers of GFRP sheet, area of weld mesh and height of drop. According to the analysis, the models provide good estimation of impact energy absorption and yielded good correlations with the data used in this study. Source

Saravanan R.,Dhanalakshmi College of Engineering | Saravanan R.,University of Madras | Gupta V.K.,Indian Institute of Technology Roorkee | Narayanan V.,University of Madras | Stephen A.,University of Madras
Journal of the Taiwan Institute of Chemical Engineers | Year: 2014

The novel ZnO/γ-Mn2O3 (various weight percentages) nanocomposite catalysts were prepared by thermal decomposition method and their size, shape, and surface area were characterized by various techniques. Further, the prepared samples were used to degrade methylene blue (MB) and methyl orange (MO) in aqueous medium under visible light irradiation. Finally, the best catalyst was employed to degrade phenol and a textile effluent. The recycling ability and their efficiency of catalyst are discussed in detail. © 2013 Taiwan Institute of Chemical Engineers. Source

Selvakumar N.,Mepco Schlenk Engineering College, Sivakasi | Jeyasubramanian K.,Mepco Schlenk Engineering College, Sivakasi | Sharmila R.,Dhanalakshmi College of Engineering
Progress in Organic Coatings | Year: 2012

Nano containers with a shell possessing controlled release properties can be used to fabricate a new family of active coatings that can respond quickly to change the environment/integrity of the coatings. The release of corrosion inhibitors encapsulated within nano containers can prevent further corrosion. The structural evolutions and morphological characteristics of nano particles are investigated using XRD, SEM, FT-IR and AFM. The author reports an in situ encapsulation method demonstrating over an order of magnitude size reduction for the preparation of urea-formaldehyde capsules filled with a healing agent, linseed oil and corrosion inhibitors. Capsules with diameters as small as 30-40 μm are achieved using stirring techniques. Cracks in paint film were successfully healed when linseed oil and nanoparticles was released from microcapsules ruptured under stimulated mechanical action. Further linseed oil healed area was found to prevent corrosion of the substrate. © 2012 Elsevier B.V. All rights reserved. Source

Arivazhagan T.,SSN College of Engineering | Arivazhagan T.,Dhanalakshmi College of Engineering | Rajesh N.P.,SSN College of Engineering
Optics and Laser Technology | Year: 2014

An organic nonlinear optical (NLO) material 4,4'-dimethoxybenzoin single crystal has been grown by vertical Bridgman technique using single wall ampoule. The grown crystal was confirmed by single crystal and powder X-ray diffraction (XRD) analyses. The functional groups of the grown crystal were identified by Fourier transform infra red analysis. The thermal behavior of the grown crystal were studied by thermo gravimetric (TG) and differential scanning calorimetric (DSC) analysis. The UV-vis-NIR spectrum has been recorded in the range 190-1100 nm and it shows that the cutoff wavelength of grown crystal is around 343 nm. The yellow emission of the grown crystal was identified by photoluminescence (PL) spectral measurements. The NLO property of the grown crystal was confirmed by Kurtz and Perry powder technique and the SHG efficiency of the grown crystal was found to be 2 times greater than KDP. The dielectric measurements were carried out and the results indicate that an increase in dielectric parameters with increase of temperature at all frequencies. © 2014 Elsevier Ltd. Source

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